Exploring the World of Energy

What is the formula for calculating kinetic energy?

• KE = m * v^2 / 2

• KE = 0.5 * m * v

• KE = 0.5 * m * v^2

• KE = m * v

Define potential energy and give an example.

• An example of potential energy is a rock positioned at the top of a hill; it has gravitational potential energy due to its height.

• A car moving at high speed has potential energy due to its velocity.

• A fish swimming in water has gravitational potential energy due to its depth.

• A stretched rubber band has no potential energy until released.

Explain the law of conservation of energy.

• Energy cannot be created or destroyed, only transformed.

• Energy can be created from nothing.

• Energy can be destroyed but not created.

• Energy is always lost in transformations.

What is thermal energy and how is it related to temperature?

• Thermal energy is only present in gases and has no relation to solids or liquids.

• Thermal energy is the total kinetic energy of particles in a substance, and it is directly related to temperature, which measures the average kinetic energy of those particles.

• Thermal energy is the energy stored in chemical bonds, unrelated to temperature.

• Temperature is the total energy of a substance, while thermal energy is the average energy of particles.

Describe the process of energy transfer with an example.

• An example of energy transfer is heating water in a pot on a stove.

• Using a battery to power a flashlight

• Wind blowing through trees

• Photosynthesis in plants

What is nuclear potential energy and where is it found?

• Nuclear potential energy is the energy stored in the bonds of molecules, found in organic compounds.

• Nuclear potential energy is the energy associated with gravitational forces, found in planets.

• Nuclear potential energy is the energy stored in atomic nuclei, found in all elements, especially heavy ones.

• Nuclear potential energy is the energy released during chemical reactions, found in gases.

How is efficiency calculated in a system?

• Efficiency = (Total Input / Useful Output) * 100

• Efficiency = (Useful Output / Total Input) * 100

• Efficiency = (Total Input - Useful Output) * 100

• Efficiency = (Useful Output + Total Input) * 100

Define work in the context of physics.

• Work is the amount of force applied to an object.

• Work is the energy transfer that occurs when a force causes an object to move.

• Work is the speed at which an object moves.

• Work is the total energy stored in an object.

What is the relationship between power and work?

• Power is the total amount of work done.

• Power decreases as work increases.

• Power is the rate of doing work.

• Work is independent of power.

List three different energy resources and their uses.

• Nuclear Energy: Used for fossil fuel extraction

• 1. Solar Energy: Used for electricity generation and heating; 2. Wind Energy: Used for electricity generation; 3. Fossil Fuels: Used for electricity generation, heating, and transportation.

• Geothermal Energy: Used for solar panel production

• Hydroelectric Energy: Used for wind turbine manufacturing